diff --git a/pytec/pytec/gui/model/thermostat.py b/pytec/pytec/gui/model/thermostat.py
index 05b605f..8a887ac 100644
--- a/pytec/pytec/gui/model/thermostat.py
+++ b/pytec/pytec/gui/model/thermostat.py
@@ -25,6 +25,7 @@ class Thermostat(QObject, metaclass=PropertyMeta):
         self._report_mode_task = None
         self._poll_for_report = True
         self.connection_errored = False
+        self.task = None
         super().__init__(parent)
 
     async def start_session(self, host, port):